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采用5kW CO_2连续激光器,在DZ125高温合金表面制备了TiN增强Co基复合涂层,并对熔覆层的显微组织、相结构、显微硬度和抗磨损性能进行了研究。结果表明:激光熔覆层主要由γ-Co、TiN、TiC、(Cr,W)_(23)C_6和Co_3Ti组成;激光熔覆层与基体形成良好的冶金结合;熔覆层中弥散分布着许多大小不等的TiC、未熔TiN及其它硬质点相,大幅度提高了熔覆层的耐磨性能,耐磨性随着扫描速度的增加而提高。
The TiN reinforced Co-based composite coating was prepared on the surface of DZ125 superalloy by using 5kW CO_2 continuous laser. The microstructure, phase structure, microhardness and wear resistance of the coating were studied. The results show that the laser cladding layer mainly consists of γ-Co, TiN, TiC, (Cr, W) _ (23) C_6 and Co_3Ti. The laser cladding layer forms a good metallurgical bond with the matrix. Many sizes of TiC, unmelted TiN and other hard phase, greatly improved the wear resistance of the coating, wear resistance increases with the scanning speed increases.